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A Government-backed study by the Environment Agency and Cranfield University has already found that among 44 sites examined, only eight had produced adequate risk assessments on protecting the surrounding area from bioaerosols.

Studies on workers at composting sites have also shown that there is a risk of respiratory infections from organisms that thrive in decaying organic matter and diseases such as farmer's lung, a common cause of breathing difficulties among farm workers.

Peter Sykes, head of the centre for public protection at the University of Wales Institute Cardiff, said: 'There is certainly an occupational risk to people working in compost sites, but the risk to residents living nearby is less well known.

'It depends on how the waste is being turned, the weather and the landscape itself.'

A survey of 132 residents living near a composting facility in Coven, Wolverhampton, carried out for Ken Purchase, MP for Wolverhampton North East, found that 66 felt the health of someone in their family had been harmed by the facility.

Mr Purchase said: 'What is clear is that the nuisance is persistent and that the smell alone prevents residents enjoying the pleasure of their gardens and, in some cases, means doors and windows have to remain shut even on good summer days.'

It usually takes three months for organic waste to turn into usable compost, during which time temperatures inside the compost heaps can hit nearly 150F (65C).

In most sites waste is piled up in the open and regularly turned over by heavy machinery, which aids composition but spreads dust.

The Environment Agency is now producing new guidance for composting sites on how to reduce their emissions.

The UK produces more than 100million tons of food and other organic waste each year but currently just 2.8million tons are sent for composting.

Trelawney Dampney, managing director of Dorset-based Eco Sustainable Solutions and a director at the Association for Organics Recycling, said the industry was aware of the concerns and followed Environment Agency guidance to try to avoid any risk to the public.

He said: 'The Environment Agency advises that all sites should be more than 250 yards from residential dwellings because within 250 yards the exposure to bioaerosols could be reasonably high, especially if they are down wind.'

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Giant compost heaps could be raising risk of skin and lung conditions for local people